Head Gasget Locked bottom end up???

My friends car blew a head gasget. he said it it started blowing out alot of white smoke stalled and now wont even turn over. he said the oil is still kinda black. whould this cause the motor to lock up

Hydrolock.. one cylinder filled with coolant..pull plugs to crank it over..

This should be posted in an engine tech forum, please advise what motor/car your friend has and we will move this to the proper forum.

Thank you.